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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Reference

Texas Instruments TL4050C20QDBZRQ1

Name: TL4050C20QDBZRQ1
Brand: Texas Instruments
SKU: TL4050C20QDBZRQ1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TL4050C20QDBZRQ1

Manufacturer:: Texas Instruments

Category:: Voltage Reference

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: TL4050C20QDBZRQ1.pdf

Description:: IC VREF SHUNT 0.5% SOT23-3

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Product details

Overview

TL4050C20QDBZRQ1 from Texas Instruments is a precision AEC-Q100 Grade 1 (–40°C to +125°C) shunt voltage reference with fixed 2.048 V output, ±0.5% initial tolerance (max), 50 ppm/°C temperature coefficient, and 41 μV_RMS wideband noise. It operates from 60 μA to 15 mA cathode current and is stable with all capacitive loads-no output capacitor required. Used in automotive power-supply monitors and high-accuracy data-acquisition systems.

For engineers reviewing the TL4050C20QDBZRQ1 datasheet, TL4050C20QDBZRQ1 pinout, TL4050C20QDBZRQ1 application, or TL4050C20QDBZRQ1 equivalent, this page delivers verified electrical specs, SOT-23-3 terminal roles, automotive-grade thermal stability data, and validated alternative options for cost-performance trade-offs in safety-critical analog signal chains.

Technical Context

The TL4050C20QDBZRQ1 functions as a two-terminal shunt reference, sinking cathode current to maintain a precise 2.048 V reverse breakdown voltage across its terminals. Its low dynamic impedance (0.3 Ω at 1 mA) and tight thermal hysteresis (0.7 mV) ensure stable regulation under varying load and temperature transients.

Designed for automotive environments, it meets AEC-Q100 Grade 1 requirements and features ESD robustness (±2 kV HBM), operation down to 41 μA minimum cathode current, and immunity to capacitive loading-enabling direct integration into ADC reference inputs and sensor signal conditioning without external compensation.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	2.048 V nominal; enables exact 12-bit LSB scaling (e.g., 1 mV per LSB in 2.048 V full-scale ADCs)
Initial Tolerance	±0.5% max at 25°C; supports mid-tier accuracy requirements without calibration
Temp Coefficient	±50 ppm/°C over –40°C to +125°C; contributes ≤0.123 V drift across full automotive range
Noise (10 Hz–10 kHz)	41 μV_RMS; limits added uncertainty to <0.02% of full scale in precision measurement
Cathode Current Range	60 μA to 15 mA typical; allows flexible biasing in ultra-low-power and high-current sensing nodes
Dynamic Impedance	0.3 Ω at 1 mA; maintains voltage stability against fast load current steps in real-time control loops
Long-Term Stability	120 ppm after 1000 h; ensures minimal calibration drift in deployed automotive ECUs

Pinout & Package

TL4050C20QDBZRQ1 is packaged in SOT-23-3 (DBZ), a 3-pin surface-mount package with 1.12 mm max height, JEDEC TO-236 compatible footprint, and RoHS-compliant NiPdAu/Sn lead finish. Pin 1 is cathode, Pin 2 is anode, and Pin 3 is a floating or anode-connected terminal to mitigate EMI in noisy automotive environments.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (Pin 1)	Current sink node	Accepts regulated current from external series resistor; voltage develops across device when I_Z ≥ 60 μA
Anode (Pin 2)	Reference ground node	Serves as circuit common; must be connected to system ground or low-impedance return path
Pin 3	EMI mitigation terminal	Internally tied to anode via parasitic Schottky diode; left floating or shorted to Pin 2 per layout noise conditions

Key Features

Feature	Design Value
AEC-Q100 Grade 1 qualification	Validated for automotive use from –40°C to +125°C ambient, including thermal cycling and life testing
No output capacitor required	Stable with any capacitive load up to 100 nF; eliminates BOM count and layout area in space-constrained modules
Low 41 μV_RMS noise	Enables 16-bit effective resolution in battery monitoring and motor phase current sensing
Wide cathode current range	Operates reliably from 60 μA (ultra-low-power wake-up circuits) to 15 mA (high-speed ADC reference buffers)
0.3 Ω dynamic impedance	Minimizes voltage droop during transient load steps in closed-loop feedback paths

Applications

Automotive Power-Supply Monitor	Data-Acquisition System Reference
Use Scenario: Monitoring 12 V battery rail and 5 V MCU supply in engine control units under cold-crank and load-dump conditions. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.048 V reference for ADC channel measuring supply voltages. Use Value: ±0.5% tolerance and ±50 ppm/°C TC ensure <±15 mV total error over –40°C to +125°C, meeting ISO 16750-2 voltage monitor accuracy requirements.	Use Scenario: High-resolution current sensing in EV battery management systems using 16-bit delta-sigma ADCs. IC Role / Device Role / Timing Role: Precision voltage reference for ADC reference input, directly replacing bulkier three-terminal references. Use Value: 41 μV_RMS noise and 0.3 Ω impedance preserve SNR >95 dB, enabling sub-milliohm shunt resistance measurements.
Process Control Sensor Interface	Energy Management Unit Calibration
Use Scenario: Conditioning thermocouple and RTD signals in industrial HVAC controllers operating in uncontrolled ambient environments. IC Role / Device Role / Timing Role: Two-terminal reference establishing accurate gain and offset in instrumentation amplifier front-ends. Use Value: Thermal hysteresis of only 0.7 mV prevents calibration drift after repeated thermal cycling between –40°C and +125°C.	Use Scenario: Factory calibration of smart meter voltage channels before field deployment. IC Role / Device Role / Timing Role: Stable bench-grade reference used during automated test equipment (ATE) calibration routines. Use Value: 120 ppm long-term stability over 1000 h reduces recalibration frequency and improves production yield consistency.

Automotive Power-Supply Monitor

Data-Acquisition System Reference

Use Scenario: Monitoring 12 V battery rail and 5 V MCU supply in engine control units under cold-crank and load-dump conditions.

IC Role / Device Role / Timing Role: Shunt reference providing stable 2.048 V reference for ADC channel measuring supply voltages.

Use Value: ±0.5% tolerance and ±50 ppm/°C TC ensure <±15 mV total error over –40°C to +125°C, meeting ISO 16750-2 voltage monitor accuracy requirements.

Use Scenario: High-resolution current sensing in EV battery management systems using 16-bit delta-sigma ADCs.

IC Role / Device Role / Timing Role: Precision voltage reference for ADC reference input, directly replacing bulkier three-terminal references.

Use Value: 41 μV_RMS noise and 0.3 Ω impedance preserve SNR >95 dB, enabling sub-milliohm shunt resistance measurements.

Process Control Sensor Interface

Energy Management Unit Calibration

Use Scenario: Conditioning thermocouple and RTD signals in industrial HVAC controllers operating in uncontrolled ambient environments.

IC Role / Device Role / Timing Role: Two-terminal reference establishing accurate gain and offset in instrumentation amplifier front-ends.

Use Value: Thermal hysteresis of only 0.7 mV prevents calibration drift after repeated thermal cycling between –40°C and +125°C.

Use Scenario: Factory calibration of smart meter voltage channels before field deployment.

IC Role / Device Role / Timing Role: Stable bench-grade reference used during automated test equipment (ATE) calibration routines.

Use Value: 120 ppm long-term stability over 1000 h reduces recalibration frequency and improves production yield consistency.

Equivalent & Alternatives

The following parts are listed as comparable options for similar shunt voltage reference applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL4050B20QDBZRQ1	±0.2% initial tolerance (vs. ±0.5%), same 2.048 V output and 50 ppm/°C TC	Better accuracy for higher-resolution ADC interfaces where calibration headroom is limited	Select when tighter initial accuracy justifies modest cost increase and thermal drift budget remains unchanged
REF3020AIDBZR	2.048 V output, ±0.2% tolerance, but only rated for –40°C to +125°C with reduced lifetime reliability vs. AEC-Q100	Lacks automotive qualification; suitable for industrial or consumer applications with similar temp range	Choose for non-automotive designs requiring identical voltage and improved tolerance without AEC-Q100 validation

Compared with TL4050B20QDBZRQ1, the TL4050C20QDBZRQ1 trades 0.3% initial accuracy for lower cost in volume automotive applications where system-level calibration compensates for tolerance; versus REF3020AIDBZR, it provides guaranteed automotive reliability and ESD robustness at the expense of slightly higher noise (41 μV_RMS vs. 33 μV_RMS).

Availability

TL4050C20QDBZRQ1 is available at Aetrix Electronics and suitable for automotive electronics, precision data-acquisition systems, and energy management units requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TL4050C20QDBZRQ1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in automotive, industrial, and power management ICs.

The TL4050-Q1 family is designed specifically for AEC-Q100-compliant automotive subsystems requiring high-accuracy, low-noise, and thermally stable voltage references in harsh environments.

FAQ

What is the maximum cathode current rating for TL4050C20QDBZRQ1?

The absolute maximum continuous cathode current for TL4050C20QDBZRQ1 is 20 mA, per the Absolute Maximum Ratings table. However, the recommended operating condition specifies a maximum cathode current of 15 mA to ensure reliable long-term performance and thermal stability within the –40°C to +125°C ambient range. Exceeding 15 mA may increase junction temperature beyond safe limits in standard PCB layouts.

Does TL4050C20QDBZRQ1 require an output capacitor for stability?

No, TL4050C20QDBZRQ1 does not require an output capacitor for stability. Its internal design ensures unconditional stability with all capacitive loads, including 0 µF. This eliminates the need for external bypass components and simplifies layout-especially valuable in compact automotive modules where board space is constrained.

What is the meaning of the 'C' grade in TL4050C20QDBZRQ1?

The 'C' in TL4050C20QDBZRQ1 denotes the initial output voltage tolerance grade: ±0.5% maximum at 25°C. This is the widest tolerance option in the TL4050-Q1 family, optimized for cost-sensitive automotive applications where system-level calibration or digital correction compensates for initial error, while retaining full Grade 1 temperature range and AEC-Q100 qualification.

How is Pin 3 used in the SOT-23-3 package of TL4050C20QDBZRQ1?

Pin 3 of TL4050C20QDBZRQ1 is internally connected to the anode via a parasitic Schottky diode. In low-noise applications, TI recommends leaving Pin 3 floating. In high-EMI environments (e.g., near ignition coils or DC-DC converters), it should be shorted to Pin 2 (anode) to suppress coupling through the parasitic junction-this is explicitly documented in the TI datasheet Section 7.2.

Is TL4050C20QDBZRQ1 qualified for automotive use?

Yes, TL4050C20QDBZRQ1 is AEC-Q100 qualified for Device Temperature Grade 1 (–40°C to +125°C), with full characterization across that range. It includes automotive-specific reliability testing, ESD ratings (±2 kV HBM), and packaging compliant with moisture sensitivity Level-1, making it suitable for engine control, body electronics, and ADAS subsystems.

TL4050C20QDBZRQ1 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Package/Case:: TO-236-3, SC-59, SOT-23-3

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Reference Type:: Shunt

Output Type:: Fixed

Voltage - Output (Min/Fixed):: 2.048V

Voltage - Output (Max):: -

Current - Output:: 15 mA

Tolerance:: ±0.5%

Temperature Coefficient:: 50ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 34µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 65 µA

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

TL4050C20QDBZRQ1 FAQ

1.How can I place an order for TL4050C20QDBZRQ1 through Aetrix?

Please submit a Request for Quotation (RFQ) for TL4050C20QDBZRQ1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for TL4050C20QDBZRQ1 reliable?

The price and inventory of TL4050C20QDBZRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL4050C20QDBZRQ1 is usually 5 days.

3.What payment methods are accepted for TL4050C20QDBZRQ1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL4050C20QDBZRQ1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TL4050C20QDBZRQ1?

TL4050C20QDBZRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TL4050C20QDBZRQ1 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for TL4050C20QDBZRQ1?

For technical support, including TL4050C20QDBZRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL4050C20QDBZRQ1 requirements.

6.How does Aetrix verify that TL4050C20QDBZRQ1 is sourced from the original manufacturer or authorized distributors?

All TL4050C20QDBZRQ1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TL4050C20QDBZRQ1 meets industry standards.

7.What is the process for return or replacement of TL4050C20QDBZRQ1?

All TL4050C20QDBZRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TL4050C20QDBZRQ1, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The TL4050C20QDBZRQ1 part is unused and in its original packaging.

Return procedure for TL4050C20QDBZRQ1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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